Eta:
S(3,3)
|AS|=...=
√2 AC: y= x to BD ⊥AC
to BD: y= −(x−3)+3 więc BD: y= −x+6 to B(x, −x+6)
| √2 | | √2 | | √5 | |
sinα= |
| ⇒ |
| = |
| ⇒ a= √10 |
| a | | a | | 5 | |
|SB|
2= (x−3)
2+(−x+6−3)
2 = 2(x−3)
2
z tw. Pitagorasa
2+2(x−3)
2= 10 ⇒ (x−3)
2= 4 ⇒ x−3=2 v x−3= −2 ⇒ x= ... v x=... to y=... v y=...
B( 5,1), D( 1, 5)
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